I liked the idea of essentially running a spam filter backward. Instead of marking things 💩, you 🌟 things, and it adjusts your filter.
Kind of like nostr:npub1utx00neqgqln72j22kej3ux7803c2k986henvvha4thuwfkper4s7r50e8 algo, but with the addition of examples, to the set of rules.